How to use GridView widget in Flutter

In this Google flutter code example we are going to learn how to use GridView widget in Flutter.

You can copy and adopt this source code example to your android project without reinventing the wheel.

The comments on the code provide more detailed explanation

The code is based on flutter version 1.

main.dart (App entry point)

import 'package:flutter/material.dart';
import 'gridview.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Baseline Widget',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: BasicGridView(),
    );
  }
}

gridview.dart

import 'package:flutter/material.dart';

class BasicGridView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("GridView Widget")),
      //there are serveral variants of Gridview
      //GridView.builder
      body: Center(
        child: Padding(
          padding: const EdgeInsets.all(8.0),
          child: GridView(
            gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
              //crossAxisCount: The number of children in the cross axis.
              crossAxisCount: 3,
              childAspectRatio: 1.0,
              mainAxisSpacing: 10.0,
              crossAxisSpacing: 10.0,
            ),
            //specify the list of children for the grid
            children: <Widget>[
              _buildContainer(),
              _buildContainer(),
              _buildContainer(),
              _buildContainer(),
              _buildContainer(),
              _buildContainer(),
              _buildContainer(),
              _buildContainer(),
              _buildContainer(),
            ],
            //specify direction in which it scrolls (horizontal or vertical).
            //scrollDirection: Axis.horizontal,
          ),
        ),
      ),
    );
  }

  Widget _buildContainer() {
    return Container(
      height: 50.0,
      width: 60.0,
      color: Colors.red,
    );
  }
}

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